Rotor spider



1. BURKE.

ROTOR SPIDER.

ION HLED P 6, 1919. 14. Patented July 11, 1922.

aniline BURKE, on ERIE, PENNSYLVANIA,

ASSIGNOR "To BURKE nnncrRrc COMPANY,

A CORPORATION OF PENNSYLVANIA;

Ro'roR srInnR.

a .A pp1ication filed November Vania, have invented certain new anduseful Improvements in Rotor Spiders, of which the following is aspecification. I

This invention relates to rotary wheels and particularly to the rotorsof electrical machinery such as the rotating field spider of analternating current generator. 'Thechief object of the invention is toprovide a wheel or spider which is builtup of stock material Without theformation of large castings which are heavy and expensive and difiicultto make.

In the accompanying drawings showing one embodiment of the invention,

Fig. 1 is a side elevation of a dynamo rotor showing some of the fieldspools mounted in place.

Fig. 2 is a vertical/sectional view of the same. a I a Fig. 3 is apartial sectional view of a modification and y r Fig. 4 is a view of oneof the parts before bending. I

In the embodiment of the invention shown in the drawings the dynamorotor or spider is composed of a hub 5, spokes 6 and rim,

or field supportin r ring 7. The hub 5 is of cast metal and theremainder of the rotor frame. or spider is formedof metal stock elementscombined and fastened together in a rigid structure for supporting theperipheral field spools. The hub 5 is trued and finished on the outsidewith a central rib portion 9 machined to receive the inner ends of armsor spokes 6. I

The spider rim portion 7 is composed of two portions, an outer rim l1and an inner rim 12. The outer rim 11 is formed by bending a strip ofmetal stock, preferably steel, into circular form, the strip beingformed as shown in Fig. 4 with ends 13, 14 cut diagonally tothe sidesand parallel to each other so that when bent into nearly circular formthese ends will overlap and the strip may be continuously fed aroundthrough the bending rolls in each direction to bring all parts intotruly circular form. The diagonal ends thus brought together are thenwelded along the diagonal line of junction 8 forming the complete ring.Within this outer rim is fitted and welded an in- Specification ofLetters Patent.

6, 1919. Serial No. 336,214. g

ner rim or felly 12 also formed from fiat stock which in this case isbent edgewise' and welded as at 16 and the complete} ring'is thenassembled within the outer rim l1 and welded in place on each side asshown at 17. The inside diameter of this felly portion is then roughlytrued and the arms are fastenedin place between the hub and rim bytemporary bolts through the holes 20 in the parts. g

The arms or spokes 6 are of steel channel beams cut to desired lengthandassembled in the spider with their flanges facing outwardly and theirwebs fiat against the hub rib 9 and the inner rim or felly 12. The

ends of the arms are spaced from the hub.

and rim 11 slightly and are Welded to the hub and rib and mm and fellyat 23, 24 as shown after which the temporary bolts are removed and thebolt holes 20 welded, as shown. The s ider is then finally trued andmachined as s own and provided with the field spools 26 bolted to therim through holes 27 therein.

The welding ofthe parts preferably supplies metal to the joints byfusingof the Patented July 11, 1922.

welding electrode or metal pencil and spaces between the edges for thiswelding metal are provided by separating or beveling them as shown. 1

In Fig. 4 a modified form ofrim portion v is shown in which the outerrim 30 is built up of two rings 31 and 32 and formed by bending andwelding similarly to rim 11 and beveled around one edge as indicated at33 for welding one to each side of the inner rim member35 theperipheryof which in this construction extends flush with the outersurface of the rim body.

. The process and apparatus of this invention provides an integralspider structure with the parts of light strong, material effectinggreat saving in weight and cost over the prior cast steel rotors. Theparts are free from hidden flaws so frequent in castings and differentsizes of rotors may be readily built up without extensive patterns foreach size and type as hitherto required. I r

I claim i 1; In a rotor for electrical machinery, the combination of ahub of cast metal having a central peripheral projection, channel barsradiall extending therefrom welded to opposite si es ofsaid projectionand having the web of said channel bars facing said projection, 'acylindrical ring or metal stock forming an outer field supporting ring,and means for fastening said ring to the ends of said bars to form a rimfor said huh.

2. In a rotor for electrical machinery, the combination of a hub of castmetal having a central peripheral projection, channel. bars radiallyextending therefrom welded to 0pposite sides of said projection andhaving the Web of said channel bars facing said projection, acylindrical ring of metal stock forming an outer field supporting ringand means for fastening said ring to the ends J AMES BURKE.

